32 resultados para GPS positioning

em Universidad Politécnica de Madrid


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El mundo actual es una fuente ilimitada de información. El manejo y análisis de estas enormes cantidades de información es casi imposible, pero también es difícil poder capturar y relacionar diferentes tipos de datos entre sí y, a partir de este análisis, sacar conclusiones que puedan conllevar a la realización, o no, de un conjunto de acciones. Esto hace necesario la implementación de sistemas que faciliten el acceso, visualización y manejo de estos datos; con el objetivo de poder relacionarlos, analizarlos, y permitir al usuario que, de la manera más sencilla posible, pueda sacar conclusiones de estos. De esta necesidad de manejar, visualizar y relacionar datos nació la plataforma Wirecloud. Wirecloud ha sido desarrollado en el laboratorio Computer Networks & Web Technologies Lab (CoNWeT Lab) del grupo CETTICO, ubicado en la Escuela Técnica Superior de Ingenieros Informáticos de la Universidad Politécnica de Madrid. Wirecloud es una plataforma de código abierto que permite, utilizando las últimas tecnologías web, recoger la información que se quiere analizar de diferentes fuentes en tiempo real e, interconectando entre sí una serie de componentes y operadores, realizar una mezcla y procesado de esta información para después usarla y mostrarla de la manera más usable posible al usuario. Un ejemplo de uso real de la plataforma podría ser: utilizar la lista de repartidores de una empresa de envío urgente para conocer cuáles son sus posiciones en tiempo real sobre un mapa utilizando el posicionamiento GPS de sus dispositivos móviles, y poder asignarles el destino y la ruta más óptima; todo esto desde la misma pantalla. El proyecto Wirecloud Mobile corresponde a la versión móvil de la plataforma Wirecloud, cuyo objetivos principales pretenden compatibilizar Wirecloud con el mayor número de sistemas operativos móviles que actualmente hay en el mercado, permitiendo su uso en cualquier parte del mundo; y poder enriquecer los componentes mencionados en el párrafo anterior con las características y propiedades nativas de los dispositivos móviles actuales, como por ejemplo el posicionamiento GPS, el acelerómetro, la cámara, el micrófono, los altavoces o tecnologías de comunicación como el Bluetooth o el NFC.---ABSTRACT---The current world is a limitless source of information. Use and analysis of this huge amount of information is nearly impossible; but it is also difficult being able to capture and relate different kinds of data to each other and, from this analysis, draw conclusions that can lead to the fulfilment or not of a set of relevant actions. This requires the implementation of systems to facilitate the access, visualization and management of this data easier; with the purpose of being capable of relate, analyse, and allow the user to draw conclusions from them. And out of this need to manage, visualize and relate data, the Wirecloud platform was born. Wirecloud has been developed at the Computer Networks & Web Technologies Lab (CoNWeT Lab) of CETTICO group, located at Escuela Técnica Superior de Ingenieros Informáticos of Universidad Politécnica de Madrid. Wirecloud is an open-source platform that allows, using the latest web technologies, to collect the information from different sources in real time and interlinking a set of widgets and operators, make a mixture and processing of this information, so then use it and show it in the most usable way. An example of the actual use of the platform could be: using the list of deliverymen from an express delivery company in order to know, using GPS positioning from their mobile devices, which are their current locations in a map; and be able to assign them the destination and optimum route; all of this from the same display/screen. Wirecloud Mobile Project is the mobile version of the Wirecloud platform, whose main objectives aim to make Wirecloud compatible with the largest amount of mobile operative systems that are currently available, allowing its use everywhere; and enriching and improving the previously mentioned components with the native specifications and properties of the present mobile devices, such as GPS positioning, accelerometer, camera, microphone, built-in speakers, or communication technologies such as Bluetooth or NFC (Near Field Communications).

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This work presents results for the three-dimensional displacement field at Tenerife Island calculated from campaign GPS and ascending and descending ENVISAT DInSAR interferograms. The goal of this work is to provide an example of the flexibility of the technique by fusing together new varieties of geodetic data, and to observe surface deformations and study precursors of potential activity in volcanic regions. Interferometric processing of ENVISAT data was performed with GAMMA software. All possible combinations were used to create interferograms and then stacking was used to increase signal-to-noise ratio. Decorrelated areas were widely observed, particularly for interferograms with large perpendicular baseline and large time span. Tropospheric signal was also observed which significantly complicated the interpretation. Subsidence signal was observed in the NW part of the island and around Mount Teide and agreed in some regions with campaign GPS data. It is expected that the technique will provide better results when more high quality DInSAR and GPS data is available

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Se muestra en este artículo el trabajo realizado durante las pruebas de carga de puesta en servicio del Nuevo Puente de Ventas sobre la M-30 de Madrid, con el fin de determinar los desplazamientos producidos mediante la aplicación de técnicas GPS, así como la discusión de precisiones obtenidas y posibilidades que encierra este tipo de sistemas de instrumentación de deformaciones en obra civil.

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The Instituto Geográfico Nacional de España, thought its geodesy department, since 1997 has carried out the establisment of a GPS Reference Station Network (ERGPS) delivered all around Spain which allows millimetric co-ordinate results, as well as velocity fields in a Global Reference System (ITRFxx). It serves as support for other geodetic networks. Some of these stations are being integrated into the EUREF (EUropean REference Frame) Permanent Station Network. The ERGPS forms the zero order of the Spanish new geodesy

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El Instituto Geográfico Nacional, por medio del Área de Geodesia, está llevando a cabo el establecimiento de una Red de Estaciones Permanentes GPS que permitan obtener coordenadas muy precisas, así como sus campos de velocidades en un Sistema de Referencia Global (ITRFxx). Dichas estaciones pertenencen a la Red de Estaciones Permanentes de EUREF (EUropean REference Framen) y constituyen el órden cero de la Geodesia Española.

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Se exponen aquí los desarrollos llevados a cabo para la monitorización del paso del Ciclón Vince, primer ciclón tropical documentado que alcanza la Península Ibérica, a través de las señales GPS de receptores en tierra durante el evento.

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Daily life in urban centers has led to increasing and more demanding freight requirements. Manufacturers, retailers and other urban agents have thus tended towards more frequent and smaller deliveries, resulting in a growing use of light freight vehicles (<3.5 ton). This paper characterizes and analyzes urban freight distribution in order to generate new ways of understanding the phenomenon. Based on a case study of two different-sized Spanish cities using data from GPS, a vehicle observation survey and complementary driver's interviews, the authors propose a categorization of urban freight distribution. The results confirm GPS as a useful tool that allows the integration of dynamic traffic assignment data and diverse traffic operation patterns during different day periods, thereby improving delivery performance.

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The need for the use of another surveillance system when radar cannot be used is the reason for the development of the Multilateration (MLT) Systems. However, there are many systems that operate in the L-Band (960-1215MHz) that could produce interference between systems. At airports, some interference has been detected between transmissions of MLT systems (1030MHz and 1090MHz) and Distance Measuring Equipment (DME) (960-1215MHz).

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The aim of this study was to examine the effect of positioning on the correctness of decision making of top-class referees and assistant referees during international games. Match analyses were carried out during the Fe´de´ration Internationale de Football Association (FIFA) Confederations Cup 2009 and 380 foul play incidents and 165 offside situations were examined. The error percentage for the referees when indicating the incidents averaged 14%. The lowest error percentage occurred in the central area of the field, where the collaboration of the assistant referee is limited, and was achieved when indicating the incidents from a distance of 11–15 m, whereas this percentage peaked (23%) in the last 15-min match period. The error rate for the assistant referees was 13%. Distance of the assistant referee to the offside line did not have an impact on the quality of the offside decision. The risk of making incorrect decisions was reduced when the assistant referees viewed the offside situations from an angle between 46 and 608. Incorrect offside decisions occurred twice as often in the second as in the first half of the games. Perceptual-cognitive training sessions specific to the requirements of the game should be implemented in the weekly schedule of football officials to reduce the overall error rate.

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El Instituto Geográfico Nacional, por medio del Área de Geodesia, está llevando a cabo el establecimiento de una Red de Estaciones Permanentes GPS que permitan obtener coordenadas muy precisas, así como sus campos de velocidades en un Sistema de Referencia Global (ITRFxx). Dichas estaciones pertenecen a la Red de Estaciones Permanentes de EUREF (EUropean REference Frame) y constituyen el orden cero de la Geodesia Española.

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El impacto de lo virtual en los nuevos sistemas de representación de la arquitectura.

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A system for simultaneous 2D estimation of rectangular room and transceiver localization is proposed. The system is based on two radio transceivers, both capable of full duplex operations (simultaneous transmission and reception). This property enables measurements of channel impulse response (CIR) at the same place the signal is transmitted (generated), commonly known as self-to-self CIR. Another novelty of the proposed system is the spatial CIR discrimination that is possible with the receiver antenna design which consists of eight sectorized antennas with 45° aperture in the horizontal plane and total coverage equal to the isotropic one. The dimensions of a rectangular room are reconstructed directly from spatial radio impulse responses by extracting the information regarding round trip time (RTT). Using radar approach estimation of walls and corners positions is derived. Tests using measured data were performed, and the simulation results confirm the feasibility of the approach.

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This paper studies the problem of determining the position of beacon nodes in Local Positioning Systems (LPSs), for which there are no inter-beacon distance measurements available and neither the mobile node nor any of the stationary nodes have positioning or odometry information. The common solution is implemented using a mobile node capable of measuring its distance to the stationary beacon nodes within a sensing radius. Many authors have implemented heuristic methods based on optimization algorithms to solve the problem. However, such methods require a good initial estimation of the node positions in order to find the correct solution. In this paper we present a new method to calculate the inter-beacon distances, and hence the beacons positions, based in the linearization of the trilateration equations into a closed-form solution which does not require any approximate initial estimation. The simulations and field evaluations show a good estimation of the beacon node positions.

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El planteamiento inicial era proveer al individuo invidente de un sistema autónomo capaz de guiarle según sus preferencias. El resultado obtenido al finalizar este proyecto ha sido un dispositivo autónomo configurable por el usuario mediante una aplicación sw , desarrollada en la plataforma móvil Android capaz de comunicarse con el dispositivo autónomo(móvil personal). La idea de utilizar como plataforma de desarrollo sw Android, se basó fundamentalmente en que es código open source, es gratuito y está presente en el 70 por ciento de los móviles de Europa. La idea inicial era que ambos hubieran sido integrados en un mismo dispositivo, pero una vez comenzado el proyecto y habiendo evaluado los hábitos actuales, decidimos adaptar la idea general del proyecto, a nuestros días. Para ello hicimos uso del dispositivo móvil más usado hoy en día, como es nuestros teléfonos móviles, o más bien los llamado Smartphone, con los cuales podemos desde su aplicación originaria que es llamar, hasta realizar multitud de operaciones al mismo tiempo como puede ser comunicación por internet, posicionamiento via GPS, intercambio de ficheros por bluetooth… tantas como podamos programar. Sobre este último atributo, intercambio de información a través de bluetooth, es la interfaz que vamos a aprovechar para la realización de nuestro proyecto. Hoy en día el 90% de los Smartphone tiene entre sus características de conectividad la posibilidad de intercambiar información vía bluetooth. Una vez se tiene resuelto el interfaz entre el medio y el usuario se debe solucionar la forma de transformar la información para que los dispositivos móviles recojan la información y sepan discernir entre la información importante y la que no lo es. Para ello hemos desarrollado una tarjeta configurable, con un módulo bluetooth comercial para enviar la información. El resultado final de esta tarjeta proporciona una manera fácil de configurar diferentes mensajes que serán utilizados según la situación. ABSTRACT The initial approach consisted of a system that shows the way for blind people to get somewhere or something or provide to them important information, an autonomous system able to guide to their preference. After several analyses the project accomplish is a standalone device configurable by the user via an application sw, developed in Android mobile platform capable of communicating with the standalone device (personal cell phone). The decision of using the sw development platform of Android was due to the open source code concept and the great extent of presence on 70 percent of European mobiles. The first idea was that the sw and the device were integrated into a single device, but once the project had been started and having assessed the current habits, it has changed to be adapted to the present technology to get a better usability on the present-day. To achieve the project goals the most used mobile device today was used, our mobile phones, or rather called Smartphone, which you could use to phone your mother or perform many operations simultaneously such as communication online, positioning via GPS, bluetooth file trading program, etc. On this last attribute, information sharing via bluetooth, is the interface that it has been taken to complete the project. Today 90% of the Smartphone include in its connectivity features the ability to exchange information via bluetooth. Once that it was solved the interface between the environment and the final user, the next step incorporates the transformation of the information that the mobile devices collect from the environment to discern between the information the user configure to be notified or not. The hardware device that makes it possible is a configurable card with a bluetooth module that is able to send the information. The final result of this card provides an easy way to configure different messages, that we could use depending of the situation.

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Hoy en día, el desarrollo tecnológico en el campo de los sistemas inteligentes de transporte (ITS por sus siglas en inglés) ha permitido dotar a los vehículos con diversos sistemas de ayuda a la conducción (ADAS, del inglés advanced driver assistance system), mejorando la experiencia y seguridad de los pasajeros, en especial del conductor. La mayor parte de estos sistemas están pensados para advertir al conductor sobre ciertas situaciones de riesgo, como la salida involuntaria del carril o la proximidad de obstáculos en el camino. No obstante, también podemos encontrar sistemas que van un paso más allá y son capaces de cooperar con el conductor en el control del vehículo o incluso relegarlos de algunas tareas tediosas. Es en este último grupo donde se encuentran los sistemas de control electrónico de estabilidad (ESP - Electronic Stability Program), el antibloqueo de frenos (ABS - Anti-lock Braking System), el control de crucero (CC - Cruise Control) y los más recientes sistemas de aparcamiento asistido. Continuando con esta línea de desarrollo, el paso siguiente consiste en la supresión del conductor humano, desarrollando sistemas que sean capaces de conducir un vehículo de forma autónoma y con un rendimiento superior al del conductor. En este trabajo se presenta, en primer lugar, una arquitectura de control para la automatización de vehículos. Esta se compone de distintos componentes de hardware y software, agrupados de acuerdo a su función principal. El diseño de la arquitectura parte del trabajo previo desarrollado por el Programa AUTOPIA, aunque introduce notables aportaciones en cuanto a la eficiencia, robustez y escalabilidad del sistema. Ahondando un poco más en detalle, debemos resaltar el desarrollo de un algoritmo de localización basado en enjambres de partículas. Este está planteado como un método de filtrado y fusión de la información obtenida a partir de los distintos sensores embarcados en el vehículo, entre los que encontramos un receptor GPS (Global Positioning System), unidades de medición inercial (IMU – Inertial Measurement Unit) e información tomada directamente de los sensores embarcados por el fabricante, como la velocidad de las ruedas y posición del volante. Gracias a este método se ha conseguido resolver el problema de la localización, indispensable para el desarrollo de sistemas de conducción autónoma. Continuando con el trabajo de investigación, se ha estudiado la viabilidad de la aplicación de técnicas de aprendizaje y adaptación al diseño de controladores para el vehículo. Como punto de partida se emplea el método de Q-learning para la generación de un controlador borroso lateral sin ningún tipo de conocimiento previo. Posteriormente se presenta un método de ajuste on-line para la adaptación del control longitudinal ante perturbaciones impredecibles del entorno, como lo son los cambios en la inclinación del camino, fricción de las ruedas o peso de los ocupantes. Para finalizar, se presentan los resultados obtenidos durante un experimento de conducción autónoma en carreteras reales, el cual se llevó a cabo en el mes de Junio de 2012 desde la población de San Lorenzo de El Escorial hasta las instalaciones del Centro de Automática y Robótica (CAR) en Arganda del Rey. El principal objetivo tras esta demostración fue validar el funcionamiento, robustez y capacidad de la arquitectura propuesta para afrontar el problema de la conducción autónoma, bajo condiciones mucho más reales a las que se pueden alcanzar en las instalaciones de prueba. ABSTRACT Nowadays, the technological advances in the Intelligent Transportation Systems (ITS) field have led the development of several driving assistance systems (ADAS). These solutions are designed to improve the experience and security of all the passengers, especially the driver. For most of these systems, the main goal is to warn drivers about unexpected circumstances leading to risk situations such as involuntary lane departure or proximity to other vehicles. However, other ADAS go a step further, being able to cooperate with the driver in the control of the vehicle, or even overriding it on some tasks. Examples of this kind of systems are the anti-lock braking system (ABS), cruise control (CC) and the recently commercialised assisted parking systems. Within this research line, the next step is the development of systems able to replace the human drivers, improving the control and therefore, the safety and reliability of the vehicles. First of all, this dissertation presents a control architecture design for autonomous driving. It is made up of several hardware and software components, grouped according to their main function. The design of this architecture is based on the previous works carried out by the AUTOPIA Program, although notable improvements have been made regarding the efficiency, robustness and scalability of the system. It is also remarkable the work made on the development of a location algorithm for vehicles. The proposal is based on the emulation of the behaviour of biological swarms and its performance is similar to the well-known particle filters. The developed method combines information obtained from different sensors, including GPS, inertial measurement unit (IMU), and data from the original vehicle’s sensors on-board. Through this filtering algorithm the localization problem is properly managed, which is critical for the development of autonomous driving systems. The work deals also with the fuzzy control tuning system, a very time consuming task when done manually. An analysis of learning and adaptation techniques for the development of different controllers has been made. First, the Q-learning –a reinforcement learning method– has been applied to the generation of a lateral fuzzy controller from scratch. Subsequently, the development of an adaptation method for longitudinal control is presented. With this proposal, a final cruise control controller is able to deal with unpredictable environment disturbances, such as road slope, wheel’s friction or even occupants’ weight. As a testbed for the system, an autonomous driving experiment on real roads is presented. This experiment was carried out on June 2012, driving from San Lorenzo de El Escorial up to the Center for Automation and Robotics (CAR) facilities in Arganda del Rey. The main goal of the demonstration was validating the performance, robustness and viability of the proposed architecture to deal with the problem of autonomous driving under more demanding conditions than those achieved on closed test tracks.